Heating unit



June 12, 1934. H. J. MONSON EIQAL HEATING UNIT 4 Sheets-Sheet 1 Filed Sept. 28, 1932 H. J. MONSON El AL HEATING UNIT Filed Sept. 28, 1932 4 Sheets-Sheet 2 ,4 IA; /4 49 1 2 26 33 M l /7 A? o m Z2 '2 /Z/3 2 W V 2a 36- 54: 12 l 1 55 53 i i I J 5 l WU l' s 4 j //,J Norma/1 T Nay/12 H. J. MONSON ET AL 1,962,694

HEATING UNIT June 12, 1934.

Filed Sept. 28, 1932 '4 Sheets-Sheet 3 June 12, 1934. J MONSON ET AL 1,962,694

HEATING UNIT Filed Sept. 28, 1952 4 Sheets-Sheet 4 Patented June 12, 1934 UNITED STATES PATENT QFFEE HEATING UNIT Application September 28, 1932, Serial No. 635,202

7 Claims. (01. 126-110) This invention relates to a hot air furnace, which is particularly adapted for use in heating homes, small buildings, stores, garages and the like and one of the main objects of the invention is to provide a heating unit of the character described which is simple in construction, efficient in operation and well adapted for use with automatic controls now in general use.

Another object of the invention is to provide a heating unit of the character described which embodies a combustion chamber and a stoker for automatically delivering fuel to the combustion chamber and which is provided with means for forcing the draft and greatly increasing the efficiency of the unit.

A further object of the invention is to provide a hot air heating furnace which is provided with a central portion shaped and designed to provide a combustion chamber and fire pot, the combustion chamber being surrounded by a casing which cooperates therewith to define a hot air chamber, the combustion chamber being provided upon its outer surface with a plurality of radially disposed vertically extending fins or projections which serve to rapidly conduct the heat to the hot air chamber.

Another object of the invention is to provide a heating unit of the character described which includes a combustion chamber and a surrounding hot air chamber in combination with a stoker or other fuel feeding apparatus for feeding fuel to the combustion chamber, the stoker including a fan and connections for delivering air to the combustion chamber both above and below the grate and also connections for delivering air from the fan to the hot air chamber whereby the air in the hot air chamber will be delivered quickly to the rooms to be heated.

Further and more limited objects of the invention will appear as the description proceeds and by reference to the accompanying drawings in which Fig. 1 is a vertical sectional view on the line l1 of Fig. 2; Fig. 2 is a sectional view on the line 2-2 of Fig. 1; Fig. 3 is a horizontal sectional View on the line 3-3 of Fig. 2; Fig. 4 is a view partly in vertical section and partly in side elevation of the fuel feeding member and its surrounding casing; Fig. 5 is a vertical sectional view on the line 55 ofFig. 4 and Fig. 6 is a horizontal sectional view on the line 6-6 of Fig. 5.

Referring now to the drawings, the reference character 1 designates a welded, sheet metal base which forms the bottom of the combustion chamber and to which is secured a circular casing 2 which is preferably formed of sheet metal having a high thermal conductivity. The casing 2 is welded to the bottom member 1 about its lower edge. The reference character 3 designates the top of the combustion chamber and it is also welded to the casing 2 about its edge. Surrounding the bottom member 1 is an angle iron 4 which is L-shaped in cross section and spaced from the base member a considerable distance. Disposed between the angle iron 4 and the casing 2 are a plurality of supports or struts 5 which serve to casing 6 is closed by means of a cover 7 which is fastened thereto. The casing 6, arranged as described, cooperates with the inner casing 2 to define therebetween a hot air chamber 8. The casing 6 is provided with a plurality of openings 9 from which lead conduits 10 which are secured in place in any suitable manner preferably by being slipped on. The casing 2, arranged as described, provides what we term the combustion chamber and secured to the outer surface thereof are a plurality of ver'tically'extending fins or projections 11 which are welded thereto. The fins 11 project into the hot air chamber and serve to rapidly conduct the heat from the combustion chamber to the hot air chamber. Secured to the inner wall of the combustion chamber is a ring member 12 which is angular in cross section and supported thereby is an annular casting 13 which is preferably formed of cast iron and which may, if desired, be made upof a plurality of parts to facilitate insertion into the combustion chamber.

Supported on the casting 13 is a lining 14 formed of fire clay or other suitable refractory material the inner face of which is inclined as shown at 15. The lining 14 provides a fire pot and arranged with n the fire pot are a plurality of grates 16,

17 and 18 which are pivotally supported on the casting 13. Extending downwardly from the grates 16, 1'7 and 18 are projections 19, 20 and 21 which are engaged by a rod 22 which projects through the outer wall of the furnace and is provided with a handle receiving portion 23 by means of which the grates may be shaken.

The outer casing 6 is provided at one side thereof with a pair of openings 24 and 25 and secured thereover is an arcuate metal plate 26 10 which is welded thereto and provided with openings which coincide with the openings 24 and 25. Pivotally secured to the plate 26 are a pair of doors 27 and 28. The opening 24 permits access to the interior of the combustion chamber and the opening permits access to the interior of the ashpit. The opening 25 is of sufiicient width to permit the insertion of a pan into the ashpit of such a size as to receive the ashes from the fire pot. The ashpit door is larger than the overall diameter of the grates which permits the use of an ash pan of a sufficient size to catch all of the ashes .which drop from the grates, and which may bereadily removed through the door so that no shoveling of ashes from the ashpit is necessary. Arranged within the hot air chamber immediate- 1y opposite the opening 24 is a conduit 29 which is welded to the casing 2 at its inner end and to the plate 26 at its outer end and providesan-entrance to the combustion chamber and fire pot. This opening is normallyv closed by the door .2 7- and the opening to the ashpit is normally closed by the door 28. This construction with its solid welds is such that no gases of combustion can escape from the combustion chamber :into the hot air chamber 8.

Disposediatthe opposite side of the furnace is a tubular conduit 39-, which extends intofthe hot air chamber. Leading from the conduit 30 is a conduitBLwhichis welded thereto atits lower end and is connected with the interior of the combustionchamber at its upper end.- The conduitBQis provided with an opening 32 over which is- -secured apipe 34 which leads to a suitable chimney. fThe conduit 30 at its outer end is provided with ajdoor:,35 having a suitable latch 35 which permits the door to be set in any one of a plurality of positionaand which serves as the usual check draft and clean-out door. The C011. duit iil conduit 30. and pipe 34 constitute a flue which connects the combustion chamber with the chimney. ;It will be seen that the conduit 31 leads from the combustion. chamber at a. point near the top :thereofandthen extends downwardly throughthe hot .air chamber and communicates with; the conduit 3i). Arranged within the pipe 34- is a suitable damper 37 which may be;set to adjust the draft: a

Positioned adjacent the furnace is a stoker S having; ahopper-38 adapted to receive a supply of :fuel; therein. Carried by the stoker is a fan F which; is ,;operated' by .anelectric ;motor (not shown), ,The outer end of the stoker. is sup ported by means, of suitable legs 395 Leading from ;the stoker isa circular conduit 40 which projects through an opening 41 provided in the outencasingfi... The delivery end of the conduit -4-0.p ..Oie0ts through anopening 42 provided in t'ne inner casing 2.. Carried "by the conduit 40 ad-jacentthe inner end thereof is an' annular plate 43 which is preferably welded to theoonduit 40 and: provided with a plurality of openings adapted to receive bolts 44 therethrough by means of-which the conduit is rigidly but detachably securedto the inner casing 2. A suit.- ablegasket may be-provided to prevent leakage of the products of combustion from the combustion chamber about the conduit 40.

Arranged within the conduit 40 is a tubular conduit 45 in which is arranged a. fuel feeding member 46 which is adapted to be'reciprocated todeliver fuel-to the combustion chamber. Also arranged within-.- the tubular conduit 40 is a casting4'7 which is circular in section as shown mostclearly in Figs. 4 and 5. Slidably mounted within the-casting. 47 is what we term a plow or fueLfeeding member 48 having a nose portion 49 0f the shape shown most clearly in Figs; 4 and 6, The-plow 48 is preferably in the form of a casting and is provided with a pair of openings 50 and 51 in the rear wall thereof which connect with a bore 51a extending longitudinally therethrough. Connected with the rear end of the plow 47 is a shaft 52 which is adapted to be actuated to impart to the plow a reciprocatory movement. Leading from the fan F is a conduit 53 which extends through the casing 6 and through the casing 2 to provide communication with the interior of the combustion chamber below the grates. Leading from the conduit 53 is a branch conduit 54 which communicates with the interior of the conduit 40. Arranged within the hot air chamber 8 is an arcuate conduit 55 which'is shaped in section, as shown most clearly in Fig. 2. and provided with a plurality of outlets 56. The arcuate conduit 55 is connected with the fan by means of a tube 5'7.

The side wall of the casing 6 is provided with a relatively largeopening 58 which constitutes a cold airinlet which may be connected either with the outside or with the cold air return leading from one of the rooms being heated.

The fuel is contained in the hopper 38' and is fed into the firebox by means of the reciprocatory fuel feeding member 46. The plow or fuel spreader 46 is also reciprocated by the stoker. The specific mechanism for operating the stoker forms no part of this invention and is not disclosed in detail. However, one form of stoker operating mechanism which may be used is disclosed in the copending application of Frank V. Monkosky, Serial No. 484,956, filed September 29, 1930, for Stoker for furnaces. It is to be understood, however, that the motor which operates the fuel feeding member and the plow also operates the fan and the switch controlling the circuit to the motor is to be thermostatically controlled and arranged to make the circuit to the motor when the temperature within one of the rooms to be heated falls below a predetermined point. When the circuit is made to the motor, the stoker is operated as is also the fan and the fuel will be delivered to the fire pot. Air. will also be delivered by the fan through the conduit 53 and the branch conduit 54 and thence through the conduit 40 and the openings 50, 51 and bores 51a in the plow. Air will also be delivered through the conduit 53 to the com bustionchambcr below the grates. The fan also delivers air through the conduit 57 and conduit 55 which is located in the hot air chamber. It will be seen that the air will be delivered to the combustion chamber both above and below the grate and also to the hot air chamber. The air being delivered to the hot air chamber through the openings 56 serves to increase the circulation of hot air through the heating unit and to maintain a more even temperature in the hot air chamber.

It will now be clear that We have provided a heating unit which will accomplish the objects of the invention as hereinbefore stated. Various changes may be made in the details of construction. as well as in the size and arrangement of parts without'departing from the spirit of our invention and the embodiment of the invention herein disclosed is to be considered merely as illustrative and not in a limiting sense as the invention is limited only in accordance with the scope'of the appended claims.

Having thus described our invention, what we claim'isz.

1. In a furnace of the character described, the combination of a combustion chamber, a casing crating therewith to define a hot air chamber, a fire pot in said combustion chamber including a grate, a stoker for delivering fuel to said fire pot, a fan operated from said stoker, connections leading from said fan for delivering a draft of air to said combustion chamber above and below said grate and to said hot air chamber, said connections including an arcuate conduit arranged within said hot air chamber and having a plurality of spaced outlets.

2. In a furnace of the character described, the combination of a combustion chamber, a casing surrounding said combustion chamber and cooperating therewith to define a hot air chamber, a fire pot in said combustion chamber including a grate, a stoker for delivering fuel to said fire pot, a fan operated from said stoker, connections leading from said fan for delivering a draft of air to said combustion chamber above and below said grate and to said hot air chamber, said stoker including a plow adapted to be projected across the fire pot and having a passageway therethrough through which air is delivered.

3. In a furnace of the character described, the combination of a combustion chamber, a casing surrounding said combustion chamber and cooperating therewith to define a hot air chamber, a fire pot in said combustion chamber including a grate, a stoker for delivering fuel to said fire pot, a fan, connections leading from said fan for delivering a draft of air to said combustion chamber above and below said grate and to said hot air chamber, said combustion chamber having a plurality of vertically extending fins thereon projecting into said hot air chamber, and a flue leading from the upper portion of said combustion chamber and extending through said hot air chamber and through the wall of said casing adjacent the lower end thereof.

4. In a heating unit of the character described, the combination of a combustion chamber including a firepot and a grate, a casing extending about said combustion chamber and cooperating therewith to define a hot air chamber, a conduit extending about said hot air chamber and having a plurality of openings therein leading into said hot air chamber, a fan for delivering air through said conduit, means for connecting said conduit with the space below said grate, means for delivering fuel to the firepot including a reciprocatory plow adapted to be projected across the firepot, and means for delivering a forced draft of air through said plow.

5. In a heating unit of the character described, the combination of a combustion chamber including a firepot and grate, a casing surrounding said combustion chamber and cooperating therewith to define a hot air chamber, means for feeding fuel into said firepot, means for spreading the fuel within the firepot including a reciprocatory plow adapted to be projected across the firepot, a fan, and connections for delivering a forced draft of air to the hot air chamber, the space below said grate and to the firepot through said plow.

6. In a heating unit of the character described, the combination of a combustion chamber including a firepot and a grate, a casing surrounding said combustion chamber and cooperating therewith to define a hot air chamber, a stoker for feeding fuel to the firepot, means for spreading the fuel within the firepot including a reciprocatory plow adapted to be projected across the firepot, and means for delivering forced drafts of air through the plow, through the bottom of said grate and to the hot air chamber simultaneously with the delivery of fuel to the fire area.

7. In a heating unit of the character described, the combination of a combustion chamber including a firepot and a grate, a casing surrounding said combustion chamber and cooperating therewith to define a hot air chamber, a stoker for feeding fuel to the firepot, means for spreading the fuel within the firepot including a reciprocatory plow adapted to be projected across the firepot, and means for delivering forced drafts of air downwardly into the fire area and upwardly into the fire area through the bottom of the grate and also to the hot air chamber, said forced drafts of air being delivered simultaneously with the spreading of fuel by the reciprocatory plow.

HUGH J. MONSON. THEODORE MAYNZ. 

